Numbers beginning with 615-810

Nashville, the capital of the U.S. state of Tennessee and the county seat of Davidson County. It is located on the Cumberland River in the north-central part of the state. The city is a center for the music, health care, publishing, banking and transportation industries, and is home to a large number of colleges and universities. Reflecting the city's position in state government, Nashville is home to the Tennessee Supreme Court's courthouse for Middle Tennessee. It is known as a center of the music industry, earning it the nickname "Music City". source

Area codes 615 and 629 are area codes in Tennessee serving Nashville (Davidson County) and the 12 surrounding counties. 615 is the main area code, while 629 is an overlay covering the same area that will begin service in 2014. Besides Nashville, Murfreesboro, Franklin, Hendersonville, and Lebanon are other major cities in the 615/629 service territory. source